USB Loader GX really weird problem

I'm using r1201 and it says No WBFS or FAT/NTFS/EXT partition found. You can select or format a partition or use the channel loader mode. Then it gives me the option of 'select', 'format' and 'channels'. It did this randomly one night with my old HDD and now with my new one, I'm not sure how to fix this. Please help.